I was never a waiter in camp but when I worked in a camp I got up early to daven with the waiters (with all the distractions that go on with making sure your young campers are sitting, behaving and davening during davening I thought I could have more kavannah if I daven earlier with the waiters).
These individuals have to get up earlier than other staff members, set up and clean up after three meals a day and they only get noticed if something goes wrong.
Waiters definitely deserve a tip.